🚨 Warning: This plugin is still experimental, and doesn't quite work as intended. Publishing here to share progress and work through minor bugs!
Use Vite and Elm with reliable HMR and full-color error messages!
npm install -D vite-plugin-elm-watch// vite.config.js
import { defineConfig } from 'vite'
import elm from 'vite-plugin-elm-watch'
export default defineConfig({
plugins: [elm()]
})// In src/main.js
import Main from './src/Main.elm'
let app = Main.init()-
Import
*.elmfiles directly from JavaScript or TypeScript - Reliable HMR powered by elm-watch
- Full-color, friendly compiler messages in the browser
- Jump to problem from your browser in one click
- JS minification step is included
- React output mode for easy interop with existing components
When using the official Elm CLI, you have access to flags that can add Elm's time-traveling debugger, or optimize your code for production.
This plugin also adds a few additional options for minifying compiled code for production and provides nice defaults in development.
'auto' // Uses "debug" in development and "minify" in production
| 'standard' // Doesn't add any Elm compiler flags
| 'debug' // Adds the `--debug` flag
| 'optimize' // Adds the `--optimize` flag
| 'minify' // Adds the `--optimize` flag and minifies the JS output 'default' // Exports standard object with "init" function
| 'react' // Exports a React component that can be dropped into an existing appThis option allows you to specify what your imported Elm code will return. For React apps, we recommend using the 'react' output so you can easily swap .jsx/.tsx files with .elm and things will just work ™️.
Warning: Still working through HMR bugs before this is production ready!
isBodyPatchEnabled : booleanIn production, you might encounter issues caused by third party JS that modify the <body> element. This only is a problem for folks using Browser.application, which expects control over the entire <body> element.
By enabling isBodyPatchEnabled: true, you'll be able to specify a custom root node. This uses Elm's standard node field when initializing the app:
// src/main.js
import Main from './src/Main.elm'
let app = Main.init({
node: document.getElementById('elm_root')
})Note: This will only work if the element has an id attribute.
A known issue is that Elm will clear out attributes for this root element, so id="elm_root" won't be visible after Elm loads.
- When in a React app, swapping a ".elm" component with a ".tsx" will causes issues with unmounting.
- React calls
removeChildinternally on the initial DOM node, before our component can runapp.unmount(). This leads to a runtime exception!
- React calls